<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style> 
        * {
            margin: 0;
            padding: 0;
        }
        section {
            width: 100%;
            height: 400px;
            background-color: rgb(68, 163, 111);
        }
        section div:nth-child(1) {
            float: left;
            width: 70%;
            height: 200px;
            background-color: pink;

            
        }
        section div:nth-child(2) {
            float: left;
            width: 30%;
            height: 200px;
            background-color: rgb(250, 192, 255);
        }
    </style>
</head>
<body>
    <!-- <div class="box1"></div>
    <div class="chuantong">
        123
    </div>
    <div class="css3">
        456
    </div>   -->
    <section>
        <div class="bix2"></div>
        <div class="bix3"></div>
    </section>
</body>
</html>